Vaisala HydroMet Guide de l'utilisateur télécharger pdf (Page 25)

Chapter 2 __________________________________________________________ Product Overview

VAISALA_______________________________________________________________________ 23

3. One connector block for communication channels.

4. Two blocks for optional communication modules.

Single-ended (H-C or L-C) or differential (H-L) measurements can be

performed in the 10 measurement channels.

NOTE

Each sensor in a basic setup has its own dedicated channel. Table 4 on

page 23 is to be used for reference purposes only.

Table 4 Analog Measurement Channels

Channels Pin Name Description

CH0, CH1, CH2,

CH3 24-bit ADC

E 12 V/25 mA voltage excitation ON/OFF,

voltage can be measured.

OR: 100 A/1mA current excitation.

H Analog input (High)

L Analog input (Low)

C The pin has been connected to ground

(GND) via a 10  resistor so that the

current can be measured.

CH4, CH5, CH6,

CH7 24-bit ADC

E 100 A/1 mA current excitation

H Analog input (High)

L Analog input (Low)

C Common return and reference level for

voltage measurements via the channel's

own E-, H-, and L-pins. The pin has been

connected directly to ground.

CHA, CHB Suitable

for fast-changing

input signals 12-bit

ADC

F Frequency input

E 0 ... 12 V/20 mA adjustable excitation

voltage, can be measured.

H Fast analog input (High)

L Fast analog input (Low)

C Common return (Analog ground)

Table 5 Power Channels

Pin Name Description

GND Ground

SDI-12 SDI-12

GND Ground

+ExtDC 8 ... 30 VDC

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 159 160

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Vaisala HydroMet Guide de l'utilisateur Page 25

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